Solution combustion synthesis of nanostructured molybdenum carbide
| Autor: | R. A. Mnatsakanyan, Kh. T. Nazaretyan, H. V. Kirakosyan, Suren Kharatyan, Sofiya Aydinyan |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Reducer Ammonium heptamolybdate Ammonium nitrate Bioengineering Isopropyl alcohol 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Molybdenum carbide 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Chemical engineering Modeling and Simulation Scientific method General Materials Science 0210 nano-technology Selectivity |
| Zdroj: | Journal of Nanoparticle Research. 20 |
| ISSN: | 1572-896X 1388-0764 |
| Popis: | A novel approach for the preparation of molybdenum carbide by solution combustion synthesis (SCS) combined with subsequent programmed heating of SCS products was proposed using ammonium heptamolybdate (AHM) and organic reducers (glycine, alanine, glucose, etc.) as precursors. It has been shown that SCS temperature and composition of the products are governed by changing the AHM-organic fuel ratio, the type of organic reducer, the rate of gaseous oxygen flow, and quantity of ammonium nitrate. A solution combustion synthesis method allowed to produce molybdenum carbide at the first stage only from the AHM-glycine system. In the other studied systems, carburization process was stimulated by the subsequent programmed heating of the SCS product, sometimes with addition of a certain amount of carbon source up to 1200 °C with Vh = 20–100°min−1. The catalytic activity and selectivity of Mo2C was tested on the model reaction of isopropyl alcohol conversion. A new phenomenon showing the temperature influence on the selectivity of either propylene or acetone formation was revealed. |
| Databáze: | OpenAIRE |
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